Modified   README.md
Modified   Rakefile
Modified   _config.yml
Modified   _includes/themes/twitter/default.html
Modified   _includes/themes/twitter/page.html
Modified   _includes/themes/twitter/post.html
Modified   _layouts/default.html
Modified   assets/themes/twitter/css/style.css

Signed-off-by: Shen Jian <shenjian74@gmail.com>